Tools / Power Tools
Bosch GHO 12V-20 Professional Planer User Guide
Quick guide for the Bosch GHO 12V-20 Professional planer, covering setup, blade replacement, dust extraction, and operation.
Table of contents
Quick guide from the manual
The Bosch GHO 12V-20 Professional is a cordless planer designed for planing wood materials like beams and boards, as well as chamfering edges and rebating. This guide provides essential information for safe and efficient operation.
Device Description
The planer features a depth adjustment knob, a button for maximizing cutting depth, an on/off switch with a lock-off button, and an adjustable planer base plate. It includes a drawer for spare blades and a selectable chip ejector (left or right).
Fitting and Setup
Before any work, remove the battery. To change the planer blade: turn the blade head until it is parallel to the adjustable base plate, loosen the two fastening screws with the provided hex key, and slide the blade out. Ensure the new blade is seated correctly in the mounting guide and tighten the screws firmly.
Operation
The tool is compatible with all Bosch 10.8V and 12V batteries. For optimal performance, use batteries with at least 2.5 Ah capacity. To start, press the lock-off button, then hold the on/off switch. The cutting depth can be adjusted from 0 to 1.0 mm using the knob; for depths up to 2.0 mm, press the maximization button.
Dust and Chip Extraction
For optimal results, use an external dust extraction system or the provided chip/dust bag. The chip ejector can be inserted on either the left or right side. Empty the dust bag regularly to maintain suction efficiency.
Safety and Maintenance
Always keep the tool and ventilation slots clean. Regularly clean the chip ejector with compressed air. Ensure the side cutter block guard remains free-moving. Do not plane over metal objects like nails or screws, as this can damage the blade and shaft.
Manufacturer information
Bosch
Practical help
Common problems
Tool switches off automatically
This may be due to electrostatic discharge. Switch the tool off and back on again to resume normal operation.
Chip ejector becomes blocked
Excessive feed rate can cause blockages. Reduce feed rate and clean the ejector with a suitable tool like a piece of wood or compressed air.
Poor surface quality
Ensure blades are sharp. Use a lower feed rate and apply pressure to the middle of the planer base plate.
Before use
- Ensure the battery is fully charged.
- Check that the planer blade is sharp and correctly installed.
- Verify that fastening screws are tightened.
- Ensure the chip ejector is clear of blockages.
- Check that the side cutter block guard moves freely.
Specs in practice
- Cutting depth (0-1.0 mm / 1.0-2.0 mm)
- Adjustable depth for planing; requires button press for depths > 1 mm.
- No-load speed (14,500 min-1)
- The speed of the blade head when not under load.
- Rebate depth (0-17 mm)
- Maximum depth for creating rebates.
Model compatibility
- Compatible with all Bosch 10.8V and 12V batteries.
- Recommended battery capacity: at least 2.5 Ah.
Manual page author
David Miller
Documentation analyst
Organizes user manual content into clear summaries, with attention to model details, product context, and everyday usability.